单选题 The professor found no student in the lecture hall when he arrived. Only then did he realize that he came ______ early.

【正确答案】 C

【答案解析】短语辨析题。so much修饰名词；much so无此搭配；首先排除B，D。too much“太多、过分”，修饰名词；much too“太……，过于……”，修饰形容词和副词。故答案为C。